Improvement after a supplement is not the same as a comparative result
Start with the comparison. A before-and-after change alone cannot isolate the contribution of an ingredient.
GABA
Selected research topic
Nutrient status
Changes were observed before and after use, but they cannot be attributed to this ingredient.
- Publications for this topic
- 1
- Human comparison publications
- 0
- Publications needing review
- 0
Findings in the studies
bioavailability
Other human research, including observational studies and reviews
- A change was reported before and after use. Its cause cannot be isolated.General population · Separable contribution · Blood sampling over 24 hours
Measurement and study conditions
- Study type
- Randomized controlled trial: subjects were randomly assigned to groups for comparison.
- Study population
- Human participants · General population
- Ingredients tested
- Separable contribution
- How results were compared
- Changes within the same group were compared. · Study comparison: GABA from pureed tomatoes versus GABA solution in water
- Additional measurement information
- Biomarker
- Measurement time
- Blood sampling over 24 hours
Representative outcome and study details
Human studies reported a within-group change in bioavailability.
Human studies · within-group comparison
1 publications linked to this result
- Route, form, dose, or population details are incomplete, so the findings cannot be confirmed as directly comparable.
Data coverage and detailed study classifications
Paper counts are separated by research topic below. One paper may contribute to multiple findings.
Analysis status: Public-ready
Ingredient analysis date:
How the grade was determined: C
The 1.5 evidence score includes 1 independent human studies and 1 clinical studies in the representative benefit area. The C tier remains conservative because of limited repetition across independent human clinical studies, too few clinical findings with an explicit effect direction.
The grade is based mainly on the research area with the most evidence. It does not mean the same result was found in other areas.
Papers linked to this ingredient overall: 90
Papers linked to this topic 1 · distinct papers 1 · comparison findings need further review · papers needing additional review 0
A publication may appear in more than one count. These numbers should not be added. Ingredient-wide papers, topic-linked papers, and sources in outcome groups use different scopes. Adding source counts may count the same paper more than once.
- bioavailability: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
What the research found
bioavailability
A change was reported before and after use. Its cause cannot be isolated.
Controlled study in people · Separable contribution · General population
Within-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
How to read research findings
How should I read research findings?
Research guidesNo clear difference and an uninterpretable result are different
A reported null comparison contains a result. An abstract without an interpretable comparison leaves a question unresolved.
Paper counts and study counts are different
Count original research separately from research that reanalyzes it. Publication volume is neither replication nor a quality rating.
Side effects and combination findings
Findings from this ingredient alone are shown separately from those involving another supplement or medication.
No combination cautions are available to show in the current data. This does not guarantee safety.
Side effects and combination studies
No side-effect or combination findings are available to show from the collected papers. This does not establish safety.